refactor: pull out onMove function definition

Todos/View/ProjectPanelView.swift

@@ -60,23 +60,11 @@ struct ProjectPanelView: View {
               }
             }
         }
-        .onMove(perform: { indices, index in
-          withAnimation {
-            task.subtasks.wrappedValue.move(fromOffsets: indices, toOffset: index)
-            for (index, item) in task.subtasks.wrappedValue.enumerated() {
-              item.sortOrder = index
-            }
-          }
-        }).moveDisabled(!move)
+        .onMove(perform: { moveItem(task.wrappedValue, $0, $1) })
+        .moveDisabled(!move)
       }
-      .onMove(perform: { indices, index in
-        withAnimation {
-          item.tasks.move(fromOffsets: indices, toOffset: index)
-          for (index, item) in item.tasks.enumerated() {
-            item.sortOrder = index
-          }
-        }
-      }).moveDisabled(!move)
+      .onMove(perform: { moveItem(item, $0, $1) })
+      .moveDisabled(!move)
     }
   }
 
@@ -88,6 +76,24 @@ struct ProjectPanelView: View {
     }
   }
 
+  private func moveItem(_ within: Project, _ fromOffsets: IndexSet, _ toOffset: Int) {
+    withAnimation {
+      within.tasks.move(fromOffsets: fromOffsets, toOffset: toOffset)
+      for (index, item) in within.tasks.enumerated() {
+        item.sortOrder = index
+      }
+    }
+  }
+
+  private func moveItem(_ within: Task, _ fromOffsets: IndexSet, _ toOffset: Int) {
+    withAnimation {
+      within.subtasks.move(fromOffsets: fromOffsets, toOffset: toOffset)
+      for (index, item) in within.subtasks.enumerated() {
+        item.sortOrder = index
+      }
+    }
+  }
+
   private func deleteItem(item: Task, from: Project) {
     withAnimation {
       from.tasks.removeAll(where: { $0.id == item.id })